"There are now five different lines of observational evidence pointing to the existence of Planet Nine," explained Konstantin Batygin, who is a planetary astrophysicist at Caltech.

"If you were to remove this explanation and imagine Planet Nine does not exist, then you generate more problems than you solve. All of a sudden, you have five different puzzles, and you must come up with five different theories to explain them."

But the conspiracy theorists could be onto something when it comes to Planet Nine.

A 2016 study from the University of Warwick warns that when the planet hurtles into the solar system on its orbit around the sun, it might throw planets out into space in a pinball effect.

But don't go hide in your bunker just yet -- it should take another 7 billion years before there's a chance of that happening.